Revert "raftstore: bugfix of the calculation on the log gap between leader and peer when restart. (#16738) (#16961)"

[LykxSassinator]

This reverts commit 5aed804.

What is changed and how it works?

Issue Number: Close #xxx

What's Changed:

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Release note

[ti-chi-bot]

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[ti-chi-bot]

Skipping CI for Draft Pull Request.
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[ti-chi-bot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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2. AFTER it has been approved by approvers, please wait for the cherry-pick merging approval from triage owners.

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